package co.yiiu.pybbs.plugin;

import co.yiiu.pybbs.model.vo.CommentsByTopic;
import co.yiiu.pybbs.service.impl.SystemConfigService;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by tomoya.
 * Copyright (c) 2018, All Rights Reserved.
 * https://yiiu.co
 */
@Component
@Aspect
public class CommentLayerPlugin {

    @Autowired
    private SystemConfigService systemConfigService;

    @Around("co.yiiu.pybbs.hook.CommentServiceHook.selectByTopicId()")
    public Object selectByTopicId(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        List<CommentsByTopic> newComments =
                (List<CommentsByTopic>) proceedingJoinPoint.proceed(proceedingJoinPoint.getArgs());
        if (systemConfigService.selectAllConfig().get("comment_layer").equals("1")) {
            // 盖楼显示评论
            return this.sortByLayer(newComments);
        }
        return newComments;
    }

    // 从列表里查找指定值的下标
    private int findLastIndex(List<CommentsByTopic> newComments, String key, Integer value) {
        int index = -1;
        for (int i = 0; i < newComments.size(); i++) {
            if (key.equals("commentId")) {
                if (value.equals(newComments.get(i).getCommentId())) {
                    index = i;
                }
            } else if (key.equals("id")) {
                if (value.equals(newComments.get(i).getId())) {
                    index = i;
                }
            }
        }
        return index;
    }

    // 盖楼排序
    private List<CommentsByTopic> sortByLayer(List<CommentsByTopic> comments) {
        List<CommentsByTopic> newComments = new ArrayList<>();
        comments.forEach(comment -> {
            if (comment.getCommentId() == null) {
                newComments.add(comment);
            } else {
                int index = this.findLastIndex(newComments, "commentId", comment.getCommentId());
                if (index == -1) {
                    int upIndex = this.findLastIndex(newComments, "id", comment.getCommentId());
                    if (upIndex == -1) {
                        newComments.add(comment);
                    } else {
                        int layer = newComments.get(upIndex).getLayer() + 1;
                        comment.setLayer(layer);
                        newComments.add(upIndex + 1, comment);
                    }
                } else {
                    int layer = newComments.get(index).getLayer();
                    comment.setLayer(layer);
                    newComments.add(index + 1, comment);
                }
            }
        });
        return newComments;
    }
}
